Abstract:
This invention relates to the manufacture of rolling-contact bearings wherein the outer and inner races or rings were hitherto made of the same steel grade and subjected to a heat treatment with or without a preliminary cementation. According to this invention, the inner races of the bearings are made of cementation steel and the outer races as well as the rolling-contact members, such as balls and rollers from corehardened alloy steel. The treatment consists of a case-hardening or cementation applied to the inner races and of a hardening process applied to the outer races and rolling bodies.
Abstract:
The apparatus of this invention comprises a cup-shaped rotary grinding wheel adapted to move in its axial direction and having a sphero-concave working surface, a circular rotary driving cage formed along its outer periphery with radial cavities adapted to receive the workpieces to be machined in a continuous cycle, these workpieces being so disposed as to have a common point of intersection with the axis of rotation of the driving cage, and a rotary track supporting and carrying along the workpieces with a movement of rotation about their axes, the cage revolving concentrically to the track and being adapted to bring the workpieces beneath the working zone of the grinding wheel.